• • MIME type: application/json.
  • Data interchange format.
  • Supports full JSON syntax but uses a specific interpretation.
  • Identifies JSON objects with lists of rules in the Wolfram Language.
  • Commonly used in web programming.
  • JSON is an acronym derived from JavaScript Object Notation.
  • Based on a subset of the JavaScript programming language.
  • Plain text format.
  • Developed in 2001.
  • Published as RFC 4627.

• Import ["file.json"] gives a rule-based representation of a JSON file.
• Export ["file.json", expr] exports a list of rules to JSON.
• Import ["file.json","elem"] imports the specified element from a JSON file.
• Import ["file.json",{"elem","sub",…}] imports a subelement.
• Import ["file.json",{{"elem₁","elem₂",…}}] imports multiple elements.
• The import format can be specified with Import ["file","JSON"] or Import ["file",{"JSON",elem,…}].
• Export ["file.json",expr,"elem"] creates a JSON file by treating expr as specifying element elem.
• Export ["file.json",expr,opt₁->val₁,…] exports expr with the specified option elements taken to have the specified values.
• Export ["file.json",{"elem₁"->expr₁,"elem₂"->expr₂,…},"Rules"] uses rules to specify the elements to be exported.
• See the following reference pages for full general information:
• Import , Export import from or export to a file
  CloudImport , CloudExport import from or export to a cloud object
  ImportString , ExportString import from or export to a string
  ImportByteArray , ExportByteArray import from or export to a byte array

• General Import elements:
• "Elements" list of elements and options available in this file
  "Summary" summary of the file
  "Rules" list of rules for all available elements
• Data representation element:
• "Data" contents of a JSON file as nested rules
  "Dataset" contents of a JSON file as a Dataset
• Import by default uses the "Data" element.
• The "JSON" format identifies JSON objects of the form {field₁:value₁,field₂:value₂,…} with lists of rules of the form {"field₁"->value₁,"field₂"->value₂,…} in the Wolfram Language.
• "JSON" identifies JSON lists [e₁,e₂,…] with Wolfram Language lists {e₁,e₂,…}.
• Strings in the Wolfram Language are represented in JSON as UTF-8 strings, escaped as required by the JSON standard.
• Numbers where scientific notation is used are given in JSON in E notation.
• The symbols True and False are represented in JSON as the values true and false.
• The symbol Null is represented as the JSON value null.

• Export option:
• "Compact" False whether to use line breaks to format file content

Basic Examples  (2)

Scope  (1)

Import Elements  (2)

Possible Issues  (1)